Improved bar for axe-bit blawks



o www JOHN LIPPINCOT'I, .-OF PITTSBURG, PENNSYLVANIA.-

Letters Patent No. 85,110, dated December 22,' 1868.

IMPROVEDBAR FOR AXE-BIT BLANKS.F

The Schedule referred to in these Letters Patent and making part of the same.

To all whom 'it may concern Be it known that I, J ons LrrrNco'rr, of the city oi' Pittsburg, in the county of Allegheny, and State of Pennsylvania, have invented a new andusefulImprovement in Making BitfBlanks or Steels for Edged Tools; and I do hereby declare the following tobe a full, clear, and exact description thereof, reference being had to the accompanying drawing, makinga part-of this speciiication, in whichl Figure 1 shows in side elevation such port-ions of a pail' of cylindrical metallic rolls, having grooves, collars, and tongues, as are necessary to illustrate my Inode oi' rolling grooved bars from which to make bit-blanks for axes; l

Figure 2 shows, in cross-section and perspective, a steel billet or bar, of proper shape, to be fed into the rolls shown in fig. 1

Figures 3 and 4 are similar views of the bar it appears at diferent stages ofthe rolling-process;

Figure 5 is a similar View of the 'g1-cored bar, coinplete, and ready to be cnt up intoaXe-bit blanks; and

Figure is a section, formed by a plane passing through the blade-part of lan ane-poll and bit-blank, at right Y angles to its edge, and illustrates the relative position ofthe two when ready for welding.

Like letters oi' reference indicate like parts.

My invention relates to/the making of steelsfor the blades or bits for that class of edged tools in which itis desirable' or advantageous/tliat the steel should, along the line or pla-ne oi' weld, ,overlap or enclose the iron on both sides; and

The nature'oi' it consists in making bars, by the process of rolling, of the shape in crosssection which is required in the bit-blank, so that nothing further is required to the cpnipletion of the bitbla-i'ik, except cutting into blanks of the proper lengths,

To enable others skilled in the art to make and use my invention, I will proceed to explain my inode of oonstruction and manner of use.

A A"are parts of a pair of cylindrical met-al rolls, the peripheries of the two being so shaped, with reference to each other, as to present a succession of rolling faces, substantially as hereinafter to be described.

A steel billet or bar, B, iig. 2; of square, rectangular, or other desirable shape, in cross-section, being irst heated, is introduced into the grooves a in the rolls A A', and made thinner along one edge, as shown at (l, iig. 3; It is then passed on its edge between the rolls A A', through one or more grooves, b', by which it gradually receives the shape required, and then between a groove, c, in one roll,` A, and a tongue, c', in the other roll, A", when it receives the shape shown at D, gA.

The process of rolling is continued, by passing the groove'd steel,

bar I) through between other grooves, d e, and tongues. d e', the 'aperture between each successive groove and tongue approaching more nearly to the shape of a bitblank in cross-sccthm, such as is shown at E, iig.

By such grooves and tongues, the part x, which is to,

form theedge of the axe, is reduced in thickness in the process of rolling, and the projecting sides of the groove y y o n the opposite edgcfarefdrawn out thin and wide, so that,'when the blanklF isplaced for welding ou to thepoll G, as in iig. 6,' the projecting' sides y y will lap well over the lsides of the poll Gr, 'and give a large welding-surface, and, at the same time', furnish what is deemed exceedingly desirable, a steel face-,to the cuttingfpart or blade of the axe. If necessary, the sides y y may be further drawn in ythe usual Way. The grooved 'bar E, thus formed, is eut or` sawed into bitblanks F of any desirable length, which are th en welded A to axe-poll G, in the usualinanner.-

By this mode of manufacture, I roll out grooved bars for bit-blanks, of any desirable length, usually from ten.

to twenty feet. I save nearly all the labor and time necessarily expended in forming the bit-blank in the" way heretofore practised, which was to cut orA force 'oln a steel bar so much steel as was rgluired foreach single blank, split it with a chisel to any reiired depth,

' and, by forging or swaging, draw out thesplit edgesto the shape shown at y y, tig. 5.

This mode of manufacture was both expensive and tedious, as each -bit-blank was made separately, anda f large amount of skilled labor was, necessarily', employed.

I also apply my invention to rolling each separate blank from a separate piece of steel, ofthe proper length, the mode of operation being the same..

I do not limit myself in my invention-to the use of any particularunirnber or arrangement of grooves and tongues in the rolls, nor to any particular shape for each groove and tongue, as these may be Varied at pleasure, and the object being merely to produce'bars having continuous'grooves ofthe shape, substantially, as described, which grooved bars, when cut into proper lengths, will give properly-shaped bit-blanks. v

What I claim as iny invention, and desire to secure by Letters Patent, is-

Grooved steel bars, made by rolling, substantially as described; as a step in the' manufacture of bit-blanks for axes.

In testimony whereof, I, the sai d JOHN Lrrrmcor'r, have hereunto set my hand.

JOHN LIPPINGOTI.

fitnesscsz ELL TORRANGE, G. H. CHRISTY. 

